Which excerpt from the article best supports your answer to question 4? O The government declined to release an explanation for what was recorded in these videos.
O The U. S. government used Area 51 to cover up aliens and UFOs.
It means that someone saw something in the sky and wasn't able to determine what exactly it was.
Ancient cave paintings around the world do show images that resemble non-human beings and flying
objects in the sky.

Explanation:

The government declined to release an explanation for what was recorded in these videos.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

1: we       2: its     3: their           4: him     5: his/her